AUTO-CRUISE CONTROL SYSTEM
Troubleshooting
13-349
8. CHECKING THE CIRCUITS RELATED
THE
<A/T>
Ignition
switch
4
control
module
E-l
Description of operation
This is a function that cancels the overdrive
function for a certain fixed period of time, if during
constant-speed travel in overdrive, the actual vehi-
cle speed decreases to less than the vehicle speed
retained in the memory, and then after a short time
causes the vehicle speed to return to the vehicle
speed retained in the memory.
Overdrive is canceled under the following condi-
tions.
1. If the “RESUME” switch is used.
2. If, during constant-speed travel, the actual
vehicle speed decreases to 1.25
mph) or more below the set vehicle speed.
Under either of the conditions described above,
the overdrive-ON signals output from the micro-
computer (within the control unit) are no longer
output, and transistor Trl is switched OFF.
As a result, transistor
is also switched OFF,
causing the current passing through the overdrive
switch of the selector handle to be interrupted
at transistor
with the result that the drive is
controlled at
gear.
Troubleshooting hint
ECU terminal voltage
No.
Conditions
Terminal voltage
13
control module
W h e n t h e
IS
O N
14
Overdrive switch
When the overdrive switch is switched ON
TSB Revision
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